A swelling of the neck due to enlargement of the thyroid gland. The thyroid creates hormones involved in metabolism and other functions. Worldwide, it is most likely to be caused by iodine deficiency, but in the United States it is more likely to be caused by nodules or changes in thyroid hormone levels.
A disease in which nodules develop in the thyroid (a gland in the front of the neck) and become overactive, producing too much thyroid hormone (a hormone involved in regulating metabolism). The exact cause is unknown.
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